How to determine if set of vectors is linearly independent?

How to simply and write the answer n a whole number

Mr. vector door is buying two new cowboy hats all together the hats cost $75.12 the second heart cost twice as much as the first hat what is the price of the more expensive at round to the nearest hundredth

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b